Serving between 1956 and 1964, the subsonic McDonnell F3H Demon was originally intended to have a single Westinghouse J40 engine, but when this powerplant was found to be insufficient, a Alison J71 was substituted instead. This engine also proved troublesome and went a long way to the Navy deciding on aircraft with two engines from that time forward.

Despite problems that saw a number of accidents, the F3H project was an important step to the McDonnell-Douglas F4 Phantom II, an aircraft that would go on to win eternal fame and still be in service in the early 21st century.